We run Exchange 2007 at our office. One server is dedicated to Edge Transport, and the other server is Mailbox, Hub Transport and Client Access. Some of the long time people at our office who have been here for 10 years get LOTS of spam daily. The president of the company averages about 200 spam per day.
The Edge transport server really should really be taking care of this problem.
Here are some of the settings we use:
Delete Messages -- Unchecked
Reject Messages -- Checked for SCL 7
Quarantine Messages -- Checked for SCL 6
Sender Reputation Properties
Sender Confidence Level -- Checked
I updated to Exchange2007 SP3 last night so Version: 08.03.0083.000 is running on both of our servers. Everyone is still getting the same amount of spam.
We are even using RBL's
...and signed up to use Barracuda's service http://www.barracudacentral.org/rbl
It doesn't seem to make much of a difference at all.
I'm starting to wonder if we have an infected computer somewhere on our LAN that is spamming people.
How do all our settings look?
What do the experts have to say about this?